方法1：如果有普通信息，就清普通信息，如果没有则判断和清理错误信息，都没有则判断是否已结束
问题：发现如果程序即有普通信息，又有错误信息，会一直清理普通信息，不管错误信息，错误信息多了有可能会导致缓冲区爆掉
while (true) {
if (scStdOut.hasNextLine()) {
System.out.println(scStdOut.nextLine()); // Standard Output Information
exitFlag = false;
}else if (scErrOut.hasNextLine()) {
System.err.println(scErrOut.nextLine()); // Error Information
exitFlag = false;
}
if(exitFlag){
try {
Thread.sleep(20); // Nothing to do, sleep a while...
p.exitValue(); // ThrowIllegalThreadStateException, if the subprocess represented by this Process object has not yet terminated.
break;
} catch (InterruptedException ex) {
ex.printStackTrace();
} catch (IllegalThreadStateException ex) {
// Process still alive
}
}
}
方法2：每次循环都会判断和清理普通信息和错误信息
问题：如果没错误信息，代码运行时会一直停在scErrOut.hasNextLine()里，如果不判断直接nextLine，也是同样的停止，直到进程结束，这样普通信息的缓冲一直没清理，有可能导致普通信息过多爆掉
while (true) {
if (scStdOut.hasNextLine()) {
System.out.println(scStdOut.nextLine()); // Standard Output Information
exitFlag = false;
}
if (scErrOut.hasNextLine()) {
System.err.println(scErrOut.nextLine()); // Error Information
exitFlag = false;
}
//下面代码同方法1一样，省略掉
}
自己解决了，过了这么就再来看，还没人回答。。汗 自己贴上来吧，希望别人能用得上
上网找，一般都是说，两边都要及时清缓冲区的话要用多线程处理，我这个不需要
/**
* 阻塞（自动清理输出缓冲区）
* @param p
* @return
* @throws IOException
*/
public static String waitFor(Process p) throws IOException{
String str = null;
InputStream is1 = p.getInputStream();
InputStream is2 = p.getErrorStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is1));
while (true) {
boolean exitFlag = true;
if (is1.available() > 0) {
Character c = new Character( (char) is1.read());
System.out.print(c);
exitFlag = false;
}
if (is2.available() > 0) {
Character c = new Character( (char) is2.read());
System.out.print(c);
exitFlag = false;
}
if(exitFlag){
try {
Thread.sleep(100); // Nothing to do, sleep a while...
p.exitValue(); // ThrowIllegalThreadStateException, if the subprocess represented by this Process object has not yet terminated.
break;
} catch (InterruptedException ex) {
ex.printStackTrace();
} catch (IllegalThreadStateException ex) {
// Process still alive
}
}
}
br.close();
is1.close();
p.destroy();
return str;
}